An experiment for measuring the low temperature vapor line of water

Velasco-S; Faro-J; Roman-FL

AMERICAN-JOURNAL-OF-PHYSICS. DEC 2000; 68 (12) : 1154-1157

A simple and low cost, but accurate, method to measure the vapor pressure curve of water below the normal boiling temperature is described. The apparatus uses the expansion power of hot air and steam. The vapor pressure is calculated by applying the ideal gas law, some elementary hydrostatics, and taking into account the water expansivity.